Just wanted to try out the plugin, which sounded really great. I run a small shop on which I want to start selling some e-books (<10 items). Unfortunately I can't even change the currency in the FREE version of this plugin, so I can't really use it. IMHO the price of 50$ for the plugin is too high. I totally see the reasons for demanding money for an intelligent plugin and the time and work invested in it - but why offer so low functionality for free usage? Couldn't be a model like getting 1% provision on every sold product be better for both sides?

The features related to payment gateway are the principal generators of support questions by multiple reasons, most of them related with the configuration of the PayPal accounts, so the free version of plugin allows to configure the minimum necessary attributes to create a functional store. Using the free version of plugin you may sell all your e-books.

The premium version of the plugin is an one time purchase, and then you may use it in all your websites and sell all your products, from only one e-book or hundreds.

In my opinion the minimum necessary attributes to create a functional store includes changing the currency as the currency in some countries is unequal the dollar.
As I can't really estimate if I will ever gain 50$ profit by selling the e-books you should understand that I, at least for the moment, won't invest this sum into a shop software. But thanks anyways for coding and supporting!